Underscreen window operator



May 31; 1932. -r 1,860,418

UNDERSCREEN WINDOW OPERATOR Filed March 16, 1931 FM N INVENTOR, BY 1ATTORNEY- Patented May 31, 1932 UNITED STATES PATENT OFFICE;

ROBERT E. HUMMER'I', OF DAYTON, OHIO, ASSIGNOR TO THE. S l-I. THOMSONMANU- FACTURING COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIOUN'DERSCREEN WINDOW OPERATOR Application filed March 16, 1931. SerialNo. 522,856.

This invention relates to new and useful improvements'in underscreenwindow operators;

It is the principal object of my invention to provide for an underscreenwindow operator, means for firmly holding the window sash in an adjustedposition against movement by the wind or other forces. This lockingmeans, which is contained within the operator casing, preferablycomprisesa pawl with two spaced off center teeth, that 1s movablethrough a slot into engagement with the teeth of the operating sector tosolidly hold it against rotation in either direction.

18 In the accompanying drawings illustrating my invention, Figure 1 is aview of a screen and window assembly containing my.

underscreen adj ustably locked window operator. Figure 2 is a bottomview of the W111- dow operating and'locking mechanism, with the coverplate removed. Figure 3 is a top plan view of the window operator,showing the button for shifting the locking pawl. And Figure 4 is a sideview of the same.

Referring to the accompanying drawings for a detailed description of myinvention, the numeral 1 designates the bottom rail of a window sashthat is hingedly secured for an outward movementin front of a station-80 ary screen 2 mounted on a stool or ledge 3.

The window 2 is swung outwardly and inwardly by an operator i'secureduponthe ledge 3. This operator comprises a channel member 5, a sectorarm 6, and handle, gear 85- and pawl mechanism to be described.

The channel mrmber 5 is secured by screws 7 in a rabbet formed withinthe under surface of the bottom rail 1 of the window sash. Slidinglysecured to this channel member 5 by a hinge pin 8 is the outer end ofthe arm 6. The latter terminates at its inner end in a toothed sector 8that is free to turn upon a pivot stud 9 within an operator case 10.

The arm 6 projects out of the operator case 10 through a fly-tightopening 11 provided in the screen 2 above the ledge 3, or it may projectthrough a cut-out portion of the ledge. The sector 8 is turned by a gear12 fast on the squared portion of a handle 13 that pro- 5 jects beyondthe case.

The pawl lfi'comprises a slidable member with fiat sides that engage thefixed projections 14, 14 for a free longitudinal movement between them.This pawl also has a rounded outer end to enter a semi-circular recessformed at the outer end of theslot,

and has two parallel teeth 16, 16 at its inner end.

The pawl 15 is mounted on the shank 17 of an operating button 18 on theexterior of the casing 10. The shank of this button is free to be movedradially outward through a slot 19 in the casingagainst the. pressure ofa helical spring 20 disposed between the rear wall" of the casing and arecess'in the pawl. I The teeth 16, 16 of the pawl are 01f cente and areadapted tobe urged inwardly by the spring 20, into engagement with theteeth of the sector 8 to completely restrain the movement of the arm 6in either direction when it is desired to hold the window 1 in anadjusted position. When in engagement with the sector 8, the two teeth16, 16 of the pawl straddle two teeth of the sector, to solidly lock thelatter against movement in either direction. This is due to the factthat the teeth 16, 16 of the pawl are off center, and it is furtherrestrained from a pivotal movement by the projections 14, 14 whichdefine Itollie slot in which it is longitudinally mova- A reverselocking thrust will, therefore, be communicated by the pawl teeth 16, 16to the teeth of the sector when a turning movement of the latter isattempted.

The pawl 15 may be easily shifted out of engagement with the sector byan outward pull upon the button 18 to permit the window to be swung bythe handle 13 to a closed po sition or another desired outward position.

It is thus seen that I have provided an provide easily actuated lockingpawl for a positive on gement with the sector 8 to completely loci thewindow in an adjusted position.

Having described my invention, I claim: 1. In a device of the typedescribed, a casing, an operating arm having a toothed sector portionpivotally secured within the casing, means for turnin said sector, aguide on the inner surface 0 said casing, directed toward the sector, apawl slidable along said guide, a compression spring between the outerwall of the casing and the outer end of the pawl to press the latterinto engagement with the teeth of the sector, said casing 15 formed witha longitudinal slot, and a finger grip member to which the pawl issecured, and movable through said slot, to withdraw the pawlfromengagement with the toothed sector. 2. In a device of the typedescribed, a casing, an operating arm having a toothed sector portionpivotally secured within said casing, means for turning said element,two parallel projections on the interior surface of :5 said casing,directed toward the sector, said casing having a longitudinal slotbetween said projections, a slidable pawl between said projections, twoparallel ofi' center teeth on the innerend of said pawl, a compressionsprin between the outer end of said pawl and the outer wall of thecasing between the projections to press said teeth into engagement withthe teeth of the sector, and a finger grip element to which the pawl isse- 35 cured, and movable through said slot, to withdraw the pawl fromengagement with the toothed sector.

In witness whereof I have hereunto set my hand this 14th day of March,1931. ROBERT H. HUMMERT.

